Serving content-relevant advertisements with client-side device support

A method for use in an environment including a client device and a content-relevant ad server, the method comprising:

• a) receiving, by the client device, a requested document including content;
• b) submitting, by the client device, a request for at least one content-relevant ad to the content-relevant ad server;
• c) receiving, by the client device, at least one content-relevant ad, sourced by the content-relevant ad server;
• and
• d) rendering, by the client device, at least one of the at least one content-relevant ad received.

Apparatus, for use in an environment including a client device and an ad server, the apparatus comprising:

• a) an input for accepting document information, sourced from an application on the client device;
• b) means for determining at least one ad relevant to content of the document using at least the accepted document information;
• and
• c) means for sending the at least one ad determined to the client device.

Apparatus, residing on a client device, for use in an environment including a content-relevant ad server, the apparatus comprising:

• a) means for submitting a request for at least one content-relevant ad to the content-relevant ad server;
• b) an input for receiving
• i) a requested document including content, and
• ii) at least one content-relevant ad, sourced by the content-relevant ad server;
• and
• c) means for rendering at least one of the at least one content-relevant ad received.